Which of the following is the most effective agent of coastal erosion?
sea current
sea waves
underground water
sea tides
Correct answer is B
No explanation has been provided for this answer.
A rock through which water cannot easily pass is termed
permeable
porous
sedimentary
impermeable
Correct answer is D
No explanation has been provided for this answer.
Which of the following is the most abundant in total volume within the atmosphere?
hydrogen
argon
nitrogen
carbondioxide
Correct answer is C
No explanation has been provided for this answer.
The lowest layer of the atmosphere is the
startosphere
troposphere
thermosphere
exosphere
Correct answer is B
No explanation has been provided for this answer.
silica and olivine
alumina and olivine
silica and alumina
alumina and phosphate
Correct answer is C
No explanation has been provided for this answer.